Kobe Bryant – and His $25K Watch – Play Ball for Charity

Kobe Bryant was announced as the new ambassador of Swiss luxury watch brand, Hublot, at the London Hotel in West Hollywood Wednesday night, where the Lakers star's limited edition "King Power Black Mamba" timepiece was unveiled.

Still recovering from his ankle injury, the basketball champ kept score in a charity shoot-off with two children from After-School All Stars Los Angeles and raised $30,000 for the Bryant Family Foundation.

"When the little girl kept missing shots, Kobe lifted her up towards the basket so she could shoot the ball in," an onlooker tells PEOPLE. "He was super sweet with the kids, and kept giving them high fives and hugs."

Bryant was joined by wife Vanessa – who wore a patterned maxi dress – at the fete, where she spent time chatting with the kids after the shoot-off.